Uranium Recovery from Aqueous Solutions Using Amidoxime Modified Cellulose Derivatives. II. Uranium Uptake Behavior of Amidoximated Ethyl Cellulose

Yıl 2018, Cilt: 5 Sayı: 2, 521 - 538, 01.01.2018

Nursel Pekel Bayramgil Seyhan Şener Başarır

https://doi.org/10.18596/jotcsa.310947

Cited By: 1

Öz

Amidoxime modified ethyl cellulose (EC-g-AO) was used for the recovery of uranyl
ions from aqueous solutions by a complexation process.  Adsorption trials were carried out in
different concentrations of UO₂²⁺
solutions (100 – 1000 mg/L) and at temperatures ranging from 25 to 50°C. The kinetics and the
thermodynamics of the adsorption of uranyl ions (UO₂²⁺)
by EC-g-AO were investigated. The
adsorption capacity was found as 240 mg UO₂²⁺/g dry
copolymer. The thermodynamic parameters for the interaction of UO₂²⁺
with EC-g-AO were calculated
from thermodynamic relations. Calculations showed that adsorption occurred through
strong electrostatic interactions with an enthalpy of -23.6 kJ/mol. The
desorption of UO₂²⁺ was investigated by desorption agents
like EDTA, HCl, NaHCO₃, and NaOH. 52 % of desorption yield was found
for NaHCO₃.

Anahtar Kelimeler

ethyl cellulose, uranium, NaHCO3, adsorption enthalpy

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